the big question is the structuring temp of the plastic you intend to inject- if its lower than the specification for High temp resin, then you should be able to inject into a printed mold.
But that is not your only concern.
The other is compatibility of the resin and the plastic you inject. For example- Polyethylene and Polypropylene are usually rotocast in aluminum molds, because they release more readily from aluminum than they do from steel.
Vinyl, on the other hand releases cleanest from nickle… and so molds are made of high nickle stainless, or are plated with nickle for a better release.
A printed resin tool might well bond to your molten plastic… or stick pretty well… so you might have to test first to determine if its an issue… and if it is, if there is a way to treat or seal the surface of the printed resin to prevent adhesion.
it is possible, for example- to print a tool and then paint it with a conductive paint… then simply electroplate a very thin coat of copper, and then a thin coat of nickle onto the surface. Mating surfaces either would have to be designed for a small play- or you would have to mask the mating surface to prevent the plating from covering that surface.